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Old 06-22-2005, 12:19 PM   #1
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to be submerged or not to be submerged

I am building a sump. the section that I made for the bio-balls has a divider that is about 12" tall. is it ok for the bio-balls to be completely submerged or must they be wet/dry thanks

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Old 06-22-2005, 01:11 PM   #2
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If they are submerged then you might as well use live rock rubble instead of bioballs. Aside from making sure you have room in your system for water that might back flow from the tank when powers out I see no problem covering the bioballs with water.

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Old 06-22-2005, 07:37 PM   #3
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I hope steve-s does not mind me quoting him but here is info he gave me on your question. In case you have not figured it out yet on this board he is "The Man"
The main use for bioballs is out of the water. Most always the largest issue with them is they are placed in an under tank environment completely submerged. This negates the purpose of what they where meant for... wet<>dry. When left submerged there is no real force flowing through/around them which allows detritus to accumulate getting trapped in the foils. This causes an increase in the production of nitrates because it is not processed any further by the system. If out of the water in a bio-tower for example, the water flows through them (this is where trickle filters came from) preventing detritus accumulation and the only water contact is from the main tank itself. Bio-rockers became popular some time ago for this reason as well. Another failing of biomaterials like this is that the bacteria are not "together" so to speak. In the main tank, all the varying bacteria species are in closer proximity allowing for the almost immediate processing of these nitrogens (if set up correctly). In a sump where there is only aerobic nitrification this process is much less efficient.
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